I just acquired what appears to be a factory sound bar with a dome light for a TJ. It has 6 wires, 2 brown (speaker), 2 Blue (another speaker) and a pink and yellow (dome light). For the dome light, which wire is the ground? Also, what are my options on how to hook up the dome light? I would ideally like to hook it up to my doors and so I can turn in on by turning my headlight switch all the way yo the left. Is this possible or am I limited to hooking up another toggle switch?? Any help would be much appreciated!!